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Normally these words are said by a small child in the early stages of primary school, but this time, it was Nick Kyrgios with the call.

Playing doubles at the Rogers Cup with American partner Jack Sock, the two were sitting courtside under a couple of umbrellas when their match against Daniel Nestor and Vasek Pospisil was stopped due to rain.

The constant pitter patter of rain drops hitting the court must have had an impact on Kyrgios, and a quick visit to the loo was on the cards. Well, it would have been, if it was allowed.

Tennis writer Aliny Calejon tweeted a bizarre exchange between Kyrgios and an official as the players suffered through the rain delay. The Aussie said he was going to the toilet when the official replied: "Not at the moment."

Kyrgios: You're not going to give me permission to go to the toilet?

Official: Not at the moment.

Kyrgios: But I'm busting. It's an emergency.

The 21-year-old then got up and complained to another official about his treatment. On his way back, he faced his nemesis and said: "I don't need to go anymore."

Nestor and Pospisil - both Canadians - had won the first set 7-6 and were down 0-1 in the second when the match ended.

The strange finish to Kyrgios' doubles campaign caps off an underwhelming time in Canada. He lost in the singles in three sets to world No. 370 Denis Shapovalov and then complained after the match that Canadian fans support their athletes much better than Australians do.

Asked what advice he'd give to his 17-year-old opponent as he continued in the tournament with increased attention from his homeland, Kyrgios used the question to stick it to everyone who has (or hasn't) supported him in Australia.

"I think the Canadians support their athletes a little better than the Australians do," Kyrgios said. "So, I think he's going to do great."

Asked if he'd like to expand on his comment, the 21-year-old said: "I think it speaks for itself."

The 11th-seed went down 7-6 (7-2) 3-6 6-3 to Shapovalov in the first round of the Toronto Masters on Tuesday (AEST) as he started his US Open build up.

The loss, which took barely 90 minutes, left Kyrgios puzzling over his continual scratchy form and occasional lack of apparent desire on court.

He was plagued by 18 double-faults while hitting 13 aces in his first match since a fourth-round Wimbledon loss to Andy Murray. Shapovalov, who won the junior Wimbledon title a fortnight ago, was playing only his second ATP event after losing last week in the opening round in Washington.